Damper-rugulator



(No- Model.)

C. G. JEW'ETT. DAMPER REGULATOR.

No. 427,327. Patented MW, 1890;

Win 195565: In VenZor:

C/zarZcS G. Jen/5Z7 UNITED STATES PATENT- OFFICEQ CHARLES G. JEWETT, OF HOW'ELL, MICHIGAN.

DAM PER-RUGULATOR.

SPECIFICATION forming part of Letters Patent No. 427,327, dated May 6, 1890.

7 Application filed December 27, 1887. $erial No. 259,034. (No model.)

To all whom it may concern:

Be it known that I, CHARLES G. J EWETT, a citizen of the United States, residingat Howell, in the county of Livingston and State of Michigan, have invented certain new and useful Improvements in Damper-Regulators, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to certain new and useful improvements in damper-regulators for furnaces, and is especially adapted for application to furnaces such as are employed in hot-water-circulatin g apparatus.

The object of the invention is to provide a device by means of which the draft and check dampers may be automatically operated so as to control the fire; and the invention consists in a drum or other vessel containing air or any other expansive fluid, gaseous or liquid, in operative contact with an independent water-circuit, whereby the air in the drum is subjected to the variations of heat of the circulating water, and permitting the fluid in said drum to act with its variable pressure upon a'diaphragm which is suitably connected with the dampers of the boiler; and, further, it consists in the peculiar construction of the parts whereby the degree of adj ustment may be varied, all as more fully hereinafter set forth.

In the accompanying drawing, which forms a part of this specification, and in which my improved device is shown in vertical sectional elevation attached to a furnace represented in elevation, A represents the furnace, which is provided with the draft-door B in the ashpit section below the grate, and the checkdra'ft door 0, as in the ordinary construction of devices of this character.

D is a tight water-vessel, which communicates with the interior of the boiler through the pipes E and F from the top and bottom of the water-vessel, respectively, and each of these pipes is provided with a globe-valve or other suitable valve G, by means of which the circulation of the water from the boiler may be cut off when desired.

H is an air-tight vessel or drum, inclosed within the water-vessel, said air-drum communicating through the pipe I with the airspace below the diaphragm J in the chamber K, and this pipe I is provided with a suitable Valve L. The piston-rod M of the diaphragm extends through the top of the chamber K, and is connected in any suitable manner to the lever N, one end of which latter is connected by any suitable system of chains and levers to the check-draft door 0, while the opposite end is likewise connected to the crank-arm O of the damper B, said doors B and 0 being suitably counterweighted to render them the more sensitive under the action of the diaphragm.

In practice, the parts being constructed and arranged substantially as herein described, their operation is as follows: As the water is heated in the boiler under the action of the fire, such water circulates through the water-vessel D and imparts its heat to the air inclosed within the air-vessel H and causes it to expand. This expansion of the air compels the diaphragm to rise, and through the medium of the piston-rod M will move the lever N in such manner that the draft-door in the ash-pit will close, while at the same time the check-door C will be proportionately opened, and thus check the fire. As the heat of the water diminishes, the air within the air-drum will become cooler, and thereby allow the diaphragm to assume its original and normal position, and under the action of the system of levers the draft-doorwill againbe opened and the check-door closed, thus allowing the fire to liven and cause an increase in the temperature of the circulating water. If the expansion of the air in the air-dru 111 causes the dampers to operate under too low a temperature, the valve L may be opened to allow some of the expanded air to escape, and upon closing such valve it will be found that it will require a higher temperature of the water in order to cause the air to expand sufficiently to operate the diaphragm and consequent action of the levers and doors. "Io fill the air-chamber 9 with air again the circulation through the cylinder D should be cut off by closing the valves G. This allows the water in such cylwill be drawn into the cylinder through the valve L, the latter being openedfor that purpose.

If desired, the lower pipe F may be provided with a valve P, by means of which the water within the cylinder may be drawn off for the purpose of allowing the air-cylinder to cool the more rapidly or for the purposes of repairs.

I am aware that it is not new to use air, steam, or other expansive fluid as a motor to operate draft regulators of furnaces and stoves, and I am also aware that it is common to inclose such fluid into a tight vessel or drum placed in contact with the heating agent of the furnace or stove; but my device presents some novelty of construction which is not found in other devices, and the object of which is to adjust the device without disturbing the draft-connections with the dampers, and to this end my invention comprises the following new features.

My regulator is placed in an independent circulating branch of the heater. This not only permits of temporarily throwing the regulator into or out of action at any desired time by closing or opening the valves G, but I gain the furtherfadvantage that I may increase or diminish the motive agent in the drum for the purpose of adj usting the regulator and without interfering in any way with any one of the heating-circuits.

What I claim as my invention is 1. In a damper-regulator, the combination, with a heater and its radiating-circuits, of an independent regulating-circuit, a vessel in said circuit through which the Water circulates, a drum in said vessel inclosing the motive agent, valves for disconnecting said regulating branch from the heater, a pipe communicating with the drum, and a valve communicating with the drum to control the motive agent therein, substantially as described.

2. The combination, with the circulatingwater apparatus, of a vessel located outside of said heater, inlet and outlet pipes connecting said vessel with the heater to form an independent circulating branch thereof, valves G, for disconnecting said vessel from the heater, adrum inclosed within the vessel and containing a motive agent, the pipe I, communicating, with the drum, and the valve L in said pipe controlling communication between the outer air and the air in thedrum, substantially as described.

In testimony whereof I affix my signature, in

presence of two witnesses, this 10th day of December, 1887.

CHARLES G. J EYVETT.

\Vitnesses:

H. S. SPRAGUE, J AS. WHITTEMORE. 

